Cole's age is 3 years less than his sister Tina's age, t. If Cole is 18, which equation represents this situation, and how old is Tina?
A. The equation that represents this situation is t - 3 = 18. Tina is 21.
B. The equation that represents this situation is t + 3 = 18. Tina is 15.
C. The equation that represents this situation is 3 - t = 18. Tina is 21.
D. The equation that represents this situation is - 3 - t = 18. Tina is 15.
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